Help with this program?

Hey guys I'm new here and I'm sorry for bugging you all but I've had some problems with this program we are assigned to work on.

This is the project:

The number of millions of gallons of sewage that are disposed of each day for a major city is measured continuously for about one month. The records, saved in a file, EX6_1.DAT, follow:
123.,134,122,128,116,96,83,144,143,156,128,138
121,129,117,96,87,148,149,151,129,138,127
126,115,94,83,142

Write a program to calculate the frequency distribution using an interval of 10 million gallons per day. But modify the program so that the input is read by calling a function named read_data (). The input specs is to use the array sewage_amt[100] to read the number of millions of gallons from file EX6_1.DAT. The output spec is to display the following data on screen: